package com.sys.websocket;

import java.io.IOException;
import java.util.*;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.Executors;

import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;

import com.alibaba.fastjson.JSONObject;
import com.sys.entity.SysMessageRecord;
import com.bhudy.exception.SysException;
import com.bhudy.exception.SysExceptionCode;
import com.sys.service.SysMessageRecordService;
import com.sys.utils.*;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;


@ServerEndpoint(value = "/sys/sysWebsocket", configurator = WebSocketConfig.class)
@Component
public final class SysWebSocketServer {
    //静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
    private static int onlineCount = 0;
    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    private static CopyOnWriteArraySet<SysWebSocketServer> webSocketSet = new CopyOnWriteArraySet<SysWebSocketServer>();

    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;

    //接收sid
    private Long userId = null;

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
        this.userId = (Long) session.getUserProperties().get("userId");
        webSocketSet.add(this);     //加入set中
        addOnlineCount();           //在线数加1
        System.out.println("有新窗口开始监听:" + userId + ",当前在线人数为" + getOnlineCount());
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);  //从set中删除
        subOnlineCount();           //在线数减1
        System.out.println("有一连接关闭！当前在线人数为" + getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        System.out.println("收到来自窗口" + userId + "的信息:" + message);
        //群发消息
        for (SysWebSocketServer item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        System.out.println("发生错误");
        error.printStackTrace();
    }

    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }


    /**
     * 群发自定义消息
     *
     * @param userId  发送用户
     * @param title   标题
     * @param content 内容
     */
    public static void send(Long userId, String title, String content) {
        Map<String, Object> messageMap = new HashMap<>();
        messageMap.put("title", title);
        messageMap.put("content", content);
        send(userId, messageMap);
    }

    /**
     * 群发自定义消息
     *
     * @param userId     发送用户
     * @param messageMap 自定义内容
     */
    public static void send(Long userId, Map<String, Object> messageMap) {
        try {
            if (userId == null || userId.equals("")) throw new SysException(SysExceptionCode.CODE_40003);

            System.out.println(userId);
            String message = JSONObject.toJSONString(messageMap);
            boolean isOnLine = false; // 是否在线
            for (SysWebSocketServer item : webSocketSet) {
                // 这里可以设定只推送给这个sid的
                if (item.userId.equals(userId)) {
                    System.out.println(message);
                    item.sendMessage(message);
                    isOnLine = true;
                    break;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        SysWebSocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        SysWebSocketServer.onlineCount--;
    }
}

